.Scientists are trying to develop a special material, they will make use of in space.A. i

发布时间：2020-08-16 10:32:01


.Scientists are trying to develop a special material,      they will make use of in space.
A. it
B. that
C. what
D. one

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A. it
B. that
C. what
(答案→)D. one
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